Convert any time between world time zones. Live world clock updates every second.
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Frequently Asked Questions
How do time zones work?
Time zones divide the world into 24 regions, each roughly 15 degrees of longitude apart (360 degrees ÷ 24 hours = 15°). Each zone uses a standard offset from UTC (Coordinated Universal Time), ranging from UTC-12 to UTC+14. When you move east you add hours, and when you move west you subtract hours. Many countries adjust their clocks seasonally for Daylight Saving Time, which temporarily shifts the UTC offset by one hour.
What is UTC and how does it relate to time zones?
UTC (Coordinated Universal Time) is the global time standard used as a reference point for all time zones. It is essentially the same as GMT (Greenwich Mean Time) and does not change for Daylight Saving Time. All other time zones are expressed as offsets from UTC — for example, New York is UTC-5 (or UTC-4 during DST), London is UTC+0 (or UTC+1 during BST), and Tokyo is UTC+9 year-round.
What is DST (Daylight Saving Time)?
Daylight Saving Time (DST) is the practice of advancing clocks by one hour in spring and setting them back in autumn to make better use of natural daylight. Not all countries observe DST — notably Japan, China, India, and most of Africa do not. In the US, DST runs from the second Sunday in March to the first Sunday in November. This means that UTC offsets for many cities change twice a year, which can affect meeting times and scheduling across time zones.